Export fmt dependency in CMake config

Author: kmilos

cmake/exiv2Config.cmake.in

@@ -25,6 +25,10 @@ if(@EXV_HAVE_LIBICONV@) # if(EXV_HAVE_LIBICONV)
     find_dependency(Iconv REQUIRED)
 endif()
 
+if(NOT @HAVE_STD_FORMAT@) # if(NOT HAVE_STD_FORMAT)
+  find_dependency(fmt REQUIRED)
+endif()
+
 include("${CMAKE_CURRENT_LIST_DIR}/exiv2Export.cmake")
 
 check_required_components(exiv2)